高震区某细粒尾矿坝动力时程抗震分析  

Dynamic Time History Seismic Analysis on a Fine Tailings Dam in High Earthquake Region

作　　者：李静 张默[2] Li Jing;Zhang Mo(Anhui Zhengyue Municipal Garden Construction Co.,Ltd.;Sinosteel Maanshan Institute of Mining Research Co.,Ltd.)

机构地区：[1]安徽政越市政园林建设有限公司 [2]中钢集团马鞍山矿山研究院有限公司

出　　处：《现代矿业》2019年第1期43-47,共5页Modern Mining

摘　　要：为防止尾矿坝发生液化现象而危及整个尾矿坝的稳定性,以西南高地震区某细粒尾矿坝为例,从细粒尾砂的动剪切模量和阻尼比以及相关试验参数为基础、按照近似场地人工拟合地震波为动力输入荷载、以等效循环剪应力与抗液化剪力比较作为液化判别的依据、借助时程应力有限元法为手段,详细分析了高震区细粒尾矿库的液化区域以及时程动稳定性。分析结果表明:液化区域主要集中在库尾水位以下,并随着孔隙水压力的积累,液化区域逐渐向深部和堆积子坝方向发展;时程动稳定性系数与拟静力法相比,稳定性系数偏小,其中仅一条地震波作用与拟静力法计算的稳定性系数基本相当,从而亦说明动力时程法在分析高震区尾矿坝动稳定性时,较符合实际地震动力作用过程,并优于传统的拟静力法。In order to prevent liquefaction,which is dangerous to the stability of the tailings dam.Based on southwest high earthquake a fine grained tailings dam as an example,the fine grain of backfilling dynamic shear modulus and damping ratio,and related test parameters for foundation,according to the approximate artificial fitting of seismic wave field as the power input load,equivalent cyclic shear stress compared with anti liquefaction shear as the basis of liquefaction discrimination,with the help of the schedule stress by means of finite element method,the detailed analysis of the high earthquake liquefaction of fine grained tailings area and dynamic stability.The results show that the liquefaction area is mainly concentrated under the water level at the end of the reservoir.In dynamic stability coefficient is compared with the pseudo-static method,stability coefficient is small,only a seismic wave action and pseudo-static method to calculate the stability coefficient of basic quite,which also shows that dynamic time history method in analysis of tailings dam in high earthquake dynamic stability,more in line with the actual seismic dynamic process,and superior to the traditional pseudo-static method.

关 键 词：细粒尾矿 高震区 动力时程法 液化区域 动力稳定性 

分 类 号：TD926.4[矿业工程—选矿]